Siren speaker



FIG. 1 is a front view of a siren speaker in accordance with our Design;

FIG. 2 is a rear view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a side view thereof, the siren speaker appearing the same when viewed from the opposite side. 

The ornamental design for a siren speaker, as shown and described. 